TEMPERATURE CHANGES OVER EURASIA DURING THE LATE SUMMER OF 1979

Ding Yihui; T. Iwashima; T. Murakami

doi:10.1007/BF03179752

Impact Factor: 5.8

Volume 2 Issue 2

Apr. 1985

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Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1985 > 2(2): 200-214

TEMPERATURE CHANGES OVER EURASIA DURING THE LATE SUMMER OF 1979

1.
Institute of Atmospheric Physics, Academia Sinica, Beijing,Department of Meteorology, University of Hawaii, Honolulu, Hawaii, U.S.A.,Department of Meteorology, University of Hawaii, Honolulu, Hawaii, U.S.A.

doi: 10.1007/BF03179752

Abstract
References
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Abstract:
During the late summer of 1979, massive changes occurred in the distribution of temperature over Eur asia north of 15oN. At 300 hPa, zonal mean temperature averaged over Eurasia along 20o－25oN de-creased sharply around 23 August. An abrupt decrease in 300 hPa zonal mean temperature also occurred over extensive mid-latitude zones (40o－55oN) around 18 August, i. e., about 5 days prior to the monsoon withdrawal over South Asia.The intensity and location of N－S oriented, vertical overturning underwent significant changes over Eurasia during the transition from summer to fall. Near 20o－25oN, zonal mean updrafts weakened con-siderably during the transition period (18－27 August). Around 45oN, zonal mean downdrafts and the asso-ciated cooling (radiative) rate increased considerably during the transition period.Near 15oN, 300 hPa zonal mean temperature fluctuated nearly periodically with an approximate 40-day period. These fluctuations appear to be associated with a small imbalance between 40-day filtered adiabatic cooling (heating) and diabatic heating (cooling).
References

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Manuscript History

Manuscript received: 10 April 1985

Manuscript revised: 10 April 1985

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

TEMPERATURE CHANGES OVER EURASIA DURING THE LATE SUMMER OF 1979

1. Institute of Atmospheric Physics, Academia Sinica, Beijing,Department of Meteorology, University of Hawaii, Honolulu, Hawaii, U.S.A.,Department of Meteorology, University of Hawaii, Honolulu, Hawaii, U.S.A.

Manuscript received: 1985-04-10
Manuscript revised: 1985-04-10

Abstract: During the late summer of 1979, massive changes occurred in the distribution of temperature over Eur asia north of 15oN. At 300 hPa, zonal mean temperature averaged over Eurasia along 20o－25oN de-creased sharply around 23 August. An abrupt decrease in 300 hPa zonal mean temperature also occurred over extensive mid-latitude zones (40o－55oN) around 18 August, i. e., about 5 days prior to the monsoon withdrawal over South Asia.The intensity and location of N－S oriented, vertical overturning underwent significant changes over Eurasia during the transition from summer to fall. Near 20o－25oN, zonal mean updrafts weakened con-siderably during the transition period (18－27 August). Around 45oN, zonal mean downdrafts and the asso-ciated cooling (radiative) rate increased considerably during the transition period.Near 15oN, 300 hPa zonal mean temperature fluctuated nearly periodically with an approximate 40-day period. These fluctuations appear to be associated with a small imbalance between 40-day filtered adiabatic cooling (heating) and diabatic heating (cooling).